MATLAB: JPEG file into an array

jpeg array

Hi,

is it possible to convert an JPEG file into an array in Matlab? What about the reverse conversion?

Owen

Best Answer

Owen - when you read the JPEG image with imread the output from this function is an array. For example,

 A = imread('myImg.jpg');

A is a matrix (multi-dimensional array). You can then use imwrite to save the matrix/array as a JPEG.

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MATLAB: Problem with reading and writing an image

imwrite(encrimage,'eimage.jpeg', 'mode', 'lossless');

However, as soon as someone does not notice that it needs to be a lossless JPEG and "helpfully" re-saves it, your program would fail again.

Lesson: Don't use JPEG for storing data.

If you are required to use JPEG for storing data then you need to do the DCT yourself, work with the values obtained, make whatever changes, and do an inverse DCT on that -- so that when you imwrite() the file, the DCT that it does automatically will end up with the data you want to store.

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The FileSize field it returns is the size of the file on disk. If you want to know the size of the uncompressed JPEG image you can multiply Width times Height times BitDepth and divide by 8

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